Paper machine press with reverse rotation lump clearing roll



Dec. 9, 1969 E. D. BEACHL ER 3,483,079

PAPER MACHINE PRESS WITH REVERSE ROTATION LUMP CLEARING ROLL 3Sheets-Sheet 1 Filed July 6, 1966 INVENTOR. E aWwafiBeac/ger BY e/M/wwwrwwmws Dec. 9, 1969 E. D. BEACHLER 3,483,079

PAPER MACHINE PRESS WITH REVERSE ROTATION LUMP CLEARING ROLL Filed July6, 1966 3 Sheets-Sheet 2 g la-@- INVENTOR. 2d zyWdfiBeJc'k Zefi BY WWWW/ NW5 Dec. 9, 1969 E, D. BEACHLER 3,483,079

PAPER MACHINE PRESS WITH REVERSE ROTATION LUMP CLEARING ROLL Filed July6, 1966 3 Sheets-Sheet 3 I N VEN TOR.

BY QQQ United States Patent 3,483,079 PAPER MACHINE PRESS WITH REVERSEROTATION LUMP CLEARING ROLL Edward D. Beachler, Beloit, Wi., assignor toBeloit Corporation, Beloit, Wis., a corporation of Wisconsin Filed July6, 1966, Ser. No. 563,264 Int. Cl. D21f 3/08 US. Cl. 162-272 ClaimsABSTRACT OF THE DISCLOSURE A pair of press rollers in a paper machineforming a press nip therebetween with a backing roll immediately inadvance of the nip for supporting a paper web carried by a felt prior toits entering the press nip; and a lump clearing roll opposite thebacking roll spaced a small distance from the paper web and driven inrotation in a direction opposite the direction of movement of the paperweb.

The present invention relates to improvements in papermaking machinesand more particularly to improvements in the press section wherein lumpsare prevented from being carried along on the web surface and enteringthe press nips.

In a papermaking machine after the web is formed and dewatered on aporous surface such as a Fourdrinier wire it passes through a presssection of the machine. In high speed high pressure press nips it isparticularly undesirable to have small lumps on the paper surface or onthe felt carry along and enter into the nip of the machine since theycan damage the felt and press and can create defects in the web.

A feature of the present invention is the provision of a lump clearingmechanism which removes lumps from the surface of the web prior to itsentering the press nip and which in one form embodies between first andsecond press nips a backing roll for supporting and establishing astable position for the web, and a lump clearing roll positioned inclose running out of contact relation with the surface of the webopposite the backing roll and rotated in a direction opposite to thedirection of the web travel so that lumps are picked off of the web andthrown in a direction away from the nip Which the web is entering.

It is accordingly an object of the present invention to provide animproved mechanism for preventing damage to the felt and nip and to theweb by removing lumps from the surface of the web or felt before itenters the nip and which is simple and reliable in construction andcapable of operating satisfactorily on a high speed paper machine.

A further object of the invention is to provide an improved lumpclearing device for a papermaking machine which does not interfere withthe normal operation of the machine, and will not cause difficulty instartups and during operation, and which is capable of operating over along life without adjustment or attention.

Other objects, advantages and features will become more apparent withthe teaching of the principles of the present invention in connectionwith the disclosure of the preferred embodiments thereof, in thespecification, claims and drawings, in which:

FIGURE 1 is a schematic side elevational view of a portion of a presssection of a paper machine showing lump removing mechanism embodying theprinciples of the present invention;

FIGURE 2 is a side elevational view showing a continuance of the machineof FIGURE 1; and

FIGURE 3 is a schematic somewhat enlarged side ICC elevational view of aportion of the machine embodying the lump removing mechanism and showingdetails.

As shown on the drawings:

As illustrated in FIGURE 1, the travelling paper web W is received byfirst press nip N-l formed between a pair of rotating press rolls 10 and11. While the press rolls may take various forms known to thepapermaking art, the lower roll 11 may be a grooved roll adapted toreceive water pressed from the web into a felt F-1 carrying the web.Several means are provided for removing water from the grooves of theroll 11. Such a construction is shown and described in US. Patents Nos.3,198,693; 3,198,694; 3,198,695; 3,198,696; and 3,198,697

The web is carried over a backing roll means 14, FIGURES 1, 2 and 3,with the felt F-1 turning down over the backing roll 14 and the webpassing through an open drawer and received by a second felt F-2. Thebacking roll rotates with the felt and provides a stable support for theweb and felt so that the location of the web will be positive foroperation of a lump clearing roll 15.

The lump clearing roll 15 is positioned opposite the backing roll, andabove the web, and is driven in a rotational direction so that itssurface rotates opposite the direction of surface movement of the web W.The lump clearing roll 15 is driven by a suitable driving means D whichmay be in the form of a variable speed motor. The roll is preferablydriven at a speed in the range of from equal to or higher than felt orweb speed to make an out going nip. An out going nip refers to the factthat the lump clearing roll rotates against the direction of the closerunning lump carrying web.

Following the lump clearing roll, the web passes on to be carried by thesecond felt F-Z into the second nip N-2 formed between opposed pressrolls 12 and 13, FIGURE 2. These press rolls may be of conventionalconstruction with the upper roll being a solid roll and the lower rollmay take various forms such as a grooved roll or rubber covered sectionroll.

The lump clearing roll 15 has a smooth outer surface and while variousconstructions are acceptable a preferred form is to have the roll formedof fiberglass. It has been found that the coaction between thefiberglass and the.

lumps of the type which form at the top of the web is such that they arepositively and effectively removed and are kicked backward in adirection away from the nip N-2. Where the machine is being started andonly a narrow tail of paper is passing through the machine, the felt isexposed to the roll 15 and it clears lumps off the felt.

The roll is supported on bearings 19 at its ends, FIG- URE 3, carried inbellcranks at the ends of the roll 15. The bellcranks are pivotallysupported on a pivot 17 and the upper arm of the crank is pivotallyconnected at 20 to a piston rod 21 of a fluid operator such as acylinder or bellows which is pivotally supported at 23. Suitable fluidpressure lines, not shown, are connected to the cylinder for operatingthe piston rod to move the lump clearing roll to a non-operatingcleaning and threading dotted line position or to an operating solidline position. In the operating solid line position the surface of thelump clearing roll 15 is in close running relation to the surface of theweb with a very small space S preferably in the range of A to 2 inches.

The space S is regulated by a stop bolt 24 which is engaged by the upperarm of the bellcrank 16 to limit its travel. The stop bolt is threadedinto a bracket 25 on the frame 18 which carries the lump clearing roll15 by supporting the pivot 17.

In order to prevent the web from following up around with the lumpclearing roll, such as at times of startup when the web tends toflutter, or at times when the web would break, a shield 26 is positionedfollowing the clearing roll 15. The shield is movable in positionsbetween a location close to the clearing roll (shown by the dotted lineposition in FIGURE 2). In this position it will be prevented fromfollowing up round the lump clearing roll 15, although in normaloperation the shield 26 can be moved down to the solid line position.

The shield is pivotally supported on a pivot 27 and moved to itspositions by an operating arm 28 pivotally connected to a piston rod 29of a piston slidable in a cylinder 30.

In summary of operation, the paper web W carried on a felt F-1 passesfrom the first nip N-1 of a press toward a second press nip N-2. It issupported by a backup roll 14 and lumps on the surface are cleared bycounter-rotating roll 15 which kicks the lumps off of the roll in adirection away from the nip N-2.

Thus it will be seen that I have provided an improved novel structurewhich meets the objectives and advantages above set forth. The structureis effective in operation and capable of very reliable efiicientoperation removing lumps from the surface of a travelling paper web athigh speeds without damaging the web and providing positive protectionfor the nip, felt and web.

The drawings and specification present a detailed disclosure of thepreferred embodiments of the invention, and it is to be understood thatthe invention is not limited to the specific forms disclosed, but coversall modifications, changes and alternative constructions and methodsfalling within the scope of the principles taught by the invention.

I claim as my invention:

1. In a press section of a papermaking machine, the combinationcomprising,

opposed press rolls forming a press nip receiving and dewatering atraveling paper web carried by a felt,

a backing means in advance of said nip in supporting relationship withthe web and felt to establish a position therefor, a lump clearing rollopposite said backing means, a means positioning said lump clearing rollin a lump clearing relationship with the surface of said web,

said lump clearing roll removing lumps from the web without engaging theweb and preventing the lumps from entering said nip, and

means for driving said lump clearing roll in a direction of rotationopposite to the direction of web travel.

2. The press section as defined in claim 1, wherein the backing meansconsists of a backing roll supporting the web, said backing rollrotating at the surface speed of the web.

3. In a press section of a papermaking machine the combination inaccordance with claim 1 wherein a shield is positioned following thelump clearing roll and on the same side of the web preventing the webfrom piling up on the lump clearing roll.

4. In a press section of a papermaking machine, the combinationcomprising,

opposed press rolls forming a first press nip receiving a travelingpaper .web carried by a felt and dewatering the web,

opposed second press rolls forming a second press nip receiving said webcarried by a felt and further dewatering said web,

a backing roll between said nips in supporting relationship with saidweb and felt, a lump clearing roll opposite said backing roll rotatingin a direction opposite the direction of web travel,

means for positioning said lump clearing rolls in a close running out ofcontact relation with the surface of said web, and

means driving the lump clearing roll in a direction of rotation oppositethe direction of surface travel of the web so that lumps will be thrownbackwards away from the second nip.

5. In a press section of a papermaking machine the combination of claim4 including a first felt carrying the web through said first press nipand over said backing roll with a second felt receiving and carrying theweb through said second nip.

6. In a press section of a papermaking machine as defined in claim 4,wherein the means for positioning the lump clearing roll is movablebetween said close running relation with the surface of the web and athreading and cleaning position spaced from the web.

7. In a press section of a papermaking machine, the combination inaccordance with claim 4 wherein said close running out of contactrelation is between A and 2 inches.

8. In a press section of a papermaking machine the combination inaccordance with claim 4 wherein the lump clearing roll is driven at aspeed in the range of equal to or faster than web speed.

9. In a press section of a papermaking machine the combination inaccordance with claim 4 wherein said lump clearing roll is constructedof fiber glass.

10. In a press section of a papermaking machine the combination inaccordance with claim 4 wherein the roll of the first press nip whichengages the side of the web engaged by the backing roll is grooved toreceive water.

References Cited UNlTED STATES PATENTS 2,441,169 5/ 1948 Roman 162-3 14XR 3,257,226 -6/ 1966 Thwaites l1764 3,216,891 11/1965 Kozich 162--308XR S. LEON BASHORE, Primary Examiner R. H. TUSHIN, Assistant ExaminerUS. Cl. X.R. 162-205, 358

